APC BackUPS Battery Backup & Portable Battery $31.05APC Back-UPS Mobile Power Pack for Routers and Phones for $44.05, and press "Clip Coupon" under the price to get $13 off.
It's a small version of their Back-UPS battery backup, only capable of protecting low-power communications and network devices like routers, switches, and phones for about 10 minutes during a power outage.
It can also be removed from its housing, and taken with you.
Charges smartphones & tablets on-the-go with 11,400mAh charging capacity, meaning it can fully charge an iPad once, or a smartphone five times.